Minolta Activa Standard Zoom Binocular Logo
Posted on Aug 30, 2009
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Double vision in minolta binoculars - Minolta Activa Standard Zoom Binocular

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  • Expert 121 Answers
  • Posted on Oct 20, 2009
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Joined: Oct 06, 2009
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Hi,

This is more common than you would think.. Here's how to set up a pair of binoculars to suit yourself.
Any good binocular will be able to do this and the reason is to allow you to adjust them for the difference in strenght between your two eyes. I wear glasses myself and sometimes contact lenses so it's good to be able to quickly adjust them.

1. turn the binoculars over so you are looking at the underside.
2. on the eyepieces can you see on one eye(usually the right eye) a little plus - minus marking. The eyepiece should be able to rotate a little to each side of this marking.
3. Set the rotating eyepiece to the middle setting.
4. Look through the binoculars as normal and bring the two sides together until you form the two circles that you see into one.
5. Pick an object app 10 meters away.
6 Presuming that the adjustable eyepiece is on the right hand side then close your right eye, look at the middle distance object you chose with your left eye and use the central focusing knob/wheel in the middle to bring your left eyepiece into focus.
7. Now, close your left eye and adjust the rotating right hand eyepiece while looking at the same object until your right eyepiece is in focus.
8. The binoculars should now be set for the differences in strenght of your eyes and you can use the middle focus control as normal.

Most binoculars have a soft rubber eyepiece that can be folded back for people who wear glasses but I, like most people I know who wear glasses, find it horribly uncomfortable.

This method allows you to set them for yourself and if someone else uses your binoculars you can quickly reset them for you.

Hope this helps...


- Oh yeah, sorry, forgot to mention.. This set up is so you can use them without wearing your glasses.. Much more comfortable!!

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One image is slightly above the other at all distances. After using the binoculars for even a couple of moments, my eyes are strained. The problem was present when the binoculars were purchased, however...

The oculars are not aligned properly causing double vision. Check on the binoculars to see if there is a place to adjust the alignment of either of the oculars. Look for any loose screws that may cause the two oculars to be out of alignment.
If this is not the case try adding some torque to the binoculars to see if the will adjust to where they will both point in the same direction. The eyes can fuse disparate images slightly but there is a very small range that they can handle. If the two images are separated by more than this small amount it will cause eye strain and double vision.
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Contact Bushnell, who was the manufacturer of Bausch and Lomb binoculars. They can service them for you.
Contact number for Bushnell is 800-423-3537.

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www.eagleoptics.com
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Double vision with the optics. Dropped and now the binocular has double vision.

The yoke which connects the eyepieces and keeps them aligned as the focus changes is damaged. If you can easily move one eyepiece back and forth with respect to the other then the yoke has broken, if not then it's bent, probably cracked and waiting to break.This is probably the most common fault on most binoculars, and it's usually uneconomic to repair.

If bent, the yoke *might* be able to be straightened, but it will be weakened and the alignment afterwards will rarely be spot-on. If broken, then the yoke must be replaced professionally but the repair often costs more than replacing the binoculars with new. The break cannot be simply glued: the contact area is too small to carry the loads it has to carry, and you also usually find that the yoke bent before breaking anyway so you then have all the same problems as you do with a bent yoke.

The fragile nature of the yoke is why binoculars must always be inserted into their case with the objective lenses facing down; this avoids shock loads on the delicate yoke assembly.

If you have a telescope and binocular repair specialist located conveniently to you then it may worth getting an estimate for repairs, but there are few these days with the skills to do so. Minolta no longer exist, so spare parts will be almost as scarce as rocking horse droppings. But if you're in the UK, then visit or phone Kay Optical for advice.

I hope that you've found my posting to be of use and in return ask only that you take a moment to rate my answer.
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1. If they are under warranty take them to a repair agent.
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I'm assuming you have set the dioptre correctly for your eyes.

Normally this is caused by a collimation error when one (or both) prisms move. This can be by a small amount.

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Your glasses have had a hard drop or jar- they are out of colluminatiom send them to Deusch Optics in Nevada
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We can align yur binoculars for your for 25-30.00 plus 5.00 to ship back to you. Some units have handy set screws to make adjustments from outside the unit. Call me, wwwbinocularservice.com
Art
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The distance between the centers of the eyepieces of your binocular must be the same as the distance between your pupils. This distance is adjusted as follows: 1. Focus on a distant object. 2. Pivot the two halves of your binocular farther or closer apart until you can see a single unobstructed, circular field of view. Make sure to focus on a distant object when you do this because when you focus on a close object you always see two slightly overlapping circular fields. Your binocular may have a scale on the top, between the eyepieces, to help you remember this setting.
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